U.S. National Security Adviser John Bolton adjusts glasses during a news briefing following his meetings with Georgian officials in Tbilisi, Georgia October 26, 2018. REUTERS/David Mdzinarishvili

TBILISI (Reuters) - The United States will do what it deems necessary, including considering more sanctions, to address Russia’s interference in its elections and its annexation of Ukraine’s Crimea, U.S.

U.S. National Security Adviser John Bolton speaks during a news briefing following his meetings with Georgian officials in Tbilisi, Georgia October 26, 2018. REUTERS/David Mdzinarishvili

TBILISI (Reuters) - U.S.

U.S. National Security Adviser John Bolton adjusts glasses during a news briefing following his meetings with Georgian officials in Tbilisi, Georgia October 26, 2018. REUTERS/David Mdzinarishvili

TBILISI (Reuters) - U.S.

ELKO, Nev/MOSCOW (Reuters) - President Donald Trump said Washington would withdraw from a landmark Cold War-era treaty that eliminated nuclear missiles from Europe because Russia was violating the pact, triggering a warning of retaliatory measures from Moscow.

MOSCOW (Reuters) - Russian President Vladimir Putin will seek an explanation of why Washington plans to pull out of an arms control treaty when he meets U.S. national security adviser John Bolton in Moscow this week, RIA news agency quoted Putin’s spokesman as saying.

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